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A small 5-200 kilometer planetesimal, with a similar mineral composition to Earth, is found orbiting in the debris disk of a white dwarf star. This discovery is among the first of its kind and expected to provide insight into the future of our own planetary system.

Astronomers discover chunk of planet's core around a dead star

The Sun will end its life as a dense, smoldering object called a white dwarf. Though our star's transition into a white dwarf will almost surely destroy Earth, a new study reports the discovery of on